Evidence used
- No CISA KEV confirmation is currently recorded.
- A structured source references public exploit or proof-of-concept material.
- EPSS is 0.33% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-67419High confidence
RabbitMQ: Consecutive topic wildcards cause combinatorial routing work
rabbitmq · rabbitmq-server
Official source article: GitHub GHSA-H964-V5MF-22CQ ↗. Check the applicable product and release in the original source.
7.1HighCVSS 4.0
Within 7 days
Fix not verifiedHigh technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:Critical, raised one band.upgradedsince 25 Sep 2026
Compensating controls
- Restrict the affected network interface to trusted sources where business-safe.
- Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
- Confirm that the asset runs rabbitmq rabbitmq-server and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
5 package statesRelease-specific package status
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | rabbitmq-server | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian bookwormbookworm · source | rabbitmq-server | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian forkyforky · source | rabbitmq-server | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian sidsid · source | rabbitmq-server | Vendor fix publishedDebian records a fixed source-package version for this release. | 4.3.6-1 | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | rabbitmq-server | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 8 Oct 2026 |
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-67419 · CSAF 2.0 · revision 2 · interimSUSE Product Security TeamCVE-2026-67419
The vendor explicitly identifies these products as affected by this CVE.
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- Summary
- RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
- Remediation
- No remediation text is recorded.
High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.
Fix not verified01
What, why and how
RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
What
RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
Why
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
Why
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material Reference recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.
- Likely attack path
- a network path → Inefficient Algorithmic Complexity → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Not a CVSS 4.0 base metric
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-407 ↗
CWE-407: Inefficient Algorithmic Complexity. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCommon Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix not verified
- Affected
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP2
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP3
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP4
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
- erlang-rabbitmq-client as component of SUSE Linux Enterprise High Performance Computing 15 SP5
- rabbitmq-server as component of SUSE Linux Enterprise High Performance Computing 15 SP5
- rabbitmq-server-plugins as component of SUSE Linux Enterprise High Performance Computing 15 SP5
- erlang-rabbitmq-client as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- erlang-rabbitmq-client313 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- rabbitmq-server as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- rabbitmq-server-plugins as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- rabbitmq-server313 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- rabbitmq-server313-bash-completion as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- rabbitmq-server313-plugins as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- rabbitmq-server313-zsh-completion as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
- erlang-rabbitmq-client as component of SUSE Linux Enterprise Server 15 SP2-LTSS
- rabbitmq-server as component of SUSE Linux Enterprise Server 15 SP2-LTSS
- rabbitmq-server-plugins as component of SUSE Linux Enterprise Server 15 SP2-LTSS
- erlang-rabbitmq-client as component of SUSE Linux Enterprise Server 15 SP2
- and 88 more
- Fixed
- No fixed version is explicitly recorded in the structured CVE data.
- Action
- No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 25 Sept 2026 · Last source change 25 Sept 2026, 17:01 UTC · CWE-407 · Inefficient Algorithmic Complexity
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-09-26
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-87243
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enrichment underway
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- ENISA EUVD mappingEUVD-2026-87243 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-87243"}
- Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.CVE.org ↗
- Before
- No public exploit
- After
- Public exploit reference
- Vendor guidanceAuthoritative vendor guidance changed: removed remediation: wid.cert-bund.de/securityadvisory?name=WID-SEC-2026-2881.CNA ↗
- Before
- remediation: wid.cert-bund.de/securityadvisory?name=WID-SEC-2026-2881
- After
- no authoritative guidance recorded
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- Open Source RabbitMQ <3.13.19; Open Source RabbitMQ <4.2.10; Open Source RabbitMQ <4.3.5; Open Source RabbitMQ <4.0.24; Open Source RabbitMQ <4.1.15 · Fixed: No fixed version is explicitly recorded in this authority advisory.
- After
- rabbitmq-server: < 4.3.5 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- SeveritySeverity changed from Unknown to High.CNA ↗
- Before
- Unknown
- After
- High
- CVSS scoreCVSS score changed from not recorded to 7.1 (CVSS 4.0 · CNA · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).CNA ↗
- Before
- not recorded
- After
- 7.1 (CVSS 4.0 · CNA · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- Catalogue recordCVE added to the BlackTree catalogue.Official national cybersecurity authority ↗
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.